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tests. the fbi is working the case with other agencies. anita brikman is with me for more on the effects of ricin. >> there is no antidote for ricin right now so avoiding exposure is paramount. it's found naturally in caster beans and can be ex trabtd during -- extracted during the processing. ricin has been tested as an experimental way to kill cancer cells but it doesn't take a lot to kill a whole person. the symptoms depend on the way you're exposed, whether the poison has been inhaled or ingested. with inhalation, people have trouble breathing. fever and cough and fluid can breathe up in their lungs. with digestion, vomiting and diarrhea are the first signs and it can lead to organ failure. the cdc says what doctors can do is supportive therapy. you support the patient, give them i.v. fluids, put them on a respirator. >> and hope they didn't take enough to kill them. >> that's exactly right. >>> we are learning more about what could prove to be the big clue at the bombing of the boss responsible marathon this hour. boston television stations say they passed these pictu
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